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I suspect this is a control arm bushing but wondering if anyone has any other ideas.

I thought it was the muffler, as it happens in corners, but I'm pretty sure it's not. I hear it when I back out of my driveway over the little lip between the road and driveway, mostly when I am on an angle to the bump. Or going around corners.

There's nothing obviously loose. The normal places have been checked. RTAB, and the shock mounts are good.

Next I'm just going to rebuild the the whole rear end and change all bushings/rear ball joints. It could be anything from a diff bolt to a sub frame bushing to a rear ball joint, I just can't pin point it, so the plan was to do all at once.

This is a long shot, but you guys should check your parking brakes. I had a rear spring break on me, resulting in the retainers for the brake shoes being partially ripped out of the backing plate. It would cause occasional binding of the shoes on the rotor which manifested as a pretty violent clunk. It was also sporadic and hard to reproduce. I replaced the RTABS to no avail and was losing my mind poring over all the rear end components trying to find the problem. Checking the parking brakes was a desperate last-gasp effort (seemed the least likely culprit) but ended up being the problem.

+1 on the parking brake. I had the shoe-retaining quarter-turn fasteners pull out of the dust guard. Parking brake would randomly engage while driving, felt like my tranny/diff/rear end was about to explode. Only clue was a subtle brake dragging noise when buildings reflected my car noise back to me.

Next I'm just going to rebuild the the whole rear end and change all bushings/rear ball joints. It could be anything from a diff bolt to a sub frame bushing to a rear ball joint, I just can't pin point it, so the plan was to do all at once.

Hmmm. I"m thinking inner bushing but of course the exhaust is on that side which makes it even more of a PITA to do .

going to shannonville tomorrow, one last kick at the can, then I will start tearing it apart.

That's a good point, I've been checking that area for cracks each time I look at my mounts but haven't found anything.
My trunk carpet has been out for years, so I do have easy access to it. My shocks have been in and out many times due to the stupid externally adjustable koni setup.